Stove-pipe damper



' 2 Sheets-Sheet.

B. J. HARRIS.

Svtovepipe Damper.

Patented Sept. 25, 1866.

I 2 Sheets-Sheef 2. B. j. HARRIS.

Sfovepipev Damper.

Patented Sept. 25, 186.6.

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N PETERS, PhnnrLiumgmpm-r. wnshi TJNITED STATES PATENT OFFICE.

B. I. HARRIS, OF HARRISBURG, PENNSYLVANIA.

STOVE-PIPE DAMPER.

Specification forming part of Letters Patent No. 58,251, dated September25, 1866.

To all whom '5t may concern.'

Beit known that I, B. I. HARRIS, of Harrisburg, in the county of Dauphinand State of Pennsylvania, have invented certain new and usefulImprovements in Stove-Pipes for Saving Fuel; and I do hereby declarethat the following is afull, clear, and exact description of the same,reference being had to the aecompanyin g drawings, and to the letters ofreference marked thereon.

In the annexed drawings, making part of this specification, A Arepresent two sections of an ordinary straight stove-pipe. Al Alrepresent two sections of pipe which arein the form of hollow frusta ot'cones, said frusta bein g joined together at their base.

The sections A A join the sections A A at their outer ends, as shown.The sections thus joined together are used as portions of stovepipe onany ordinary stove.

Around the lower frustum, below its center, are a series of perforationsor holes, b b b, which admit cold air to the inside of the pipe. Theseperforations or holes may or may not be protected by the caps c c. It isnot necessary that they should be protected, and if protected it will bemore for ornament than for actual service.

B represents an opening which is cut in the upper frustum, which saidopening may or may not be provided with a door for closing it. As withthe openings in the lower frustum, so with the opening in the upper-theyboth do best when left open and free to receive and admit external air.

The currents of air received through the openings or perforations b bpass in toward the center of the pipe; but being met by the current fromdoor or opening B they are re*- versed and retarded and thrown from theceni ter toward the sides of the pipe. This retarding and reversing ofthe currents not only retards the combustion of the fuel in the stove,but serves to make the pipe receive and radiate more heat.

This invention on an ordinary stove will cause it to burn less fuel andyield more heat than without it.

Two stoves of the same construction and equal capacity have been triedfor one month in a large building, one with and one without this pipe,and an accurate account kept of the amount of fuel consumed by each, andit has been ascertained from this experiment that the stove with myimproved pipe cousumes one-third less fuel, at least, and yields as muchheat.

I have ascertained by actual experiment that a swelled joint, such as isshown, with two openings, or openings above'and below the center of thejoint, is necessary to produce the best results. One opening will notanswer,neither will two opeuings,in astraight ordinary stovepipe.

I do not claim the swelled joint of itself, nor do I claim making anopening in the side of a pipe for admitting air; but,

Having thus fully described my invention, whatI do claim as new, anddesire to secure by Letters Patent, is

The swelled joint composed of the sect-ions A A', when the lowersectionis provided with perforations or holes, and the uppersection withan opening or door, substantially in the manner and for the purposeherein specified.

In witness that I claim the foregoing I have hereunto set my hand in thepresence of two witnesses.

B. L HARRIS.

Witnesses J. C. YOUNG, C. L. HERMAN.

